How should teams govern Active Directory service accounts in hybrid estates?

TL;DR: Active Directory service accounts remain a quiet but persistent non-human identity risk because they often outlive their purpose, inherit broad permissions, and become difficult to own or remediate, according to Entro Security. Legacy directory controls do not solve the governance problem when effective access, ownership, and blast radius are still unclear.

Editorial analysis by NHI Mgmt Group, based on content published by Entro Security: “Legacy, Not Ancient: The On-Prem NHI Risk of Active Directory Service Accounts”.

Key questions

Q: What breaks when Active Directory service accounts are not inventoried as NHIs?

A: Teams lose sight of which identities are still active, who owns them, and what they can reach through inherited permissions.

Q: Why do service accounts increase lateral movement risk in enterprise environments?

A: Service accounts often connect multiple systems, so they sit at the center of trust relationships that humans never see directly.

Q: What are the signs that a service account is being used outside its intended role?

A: Look for interactive logons, RDP, console access, or appearance on unusual hosts.

Practitioner guidance

• Map effective access paths for every service account Expand nested groups, OU scope, delegated rights, and object ACLs or ACEs so you can see what each account can actually reach.
• Assign accountable ownership to each account Tie every service account to a responsible human or team, plus the application or workload that depends on it, before attempting rotation or decommissioning.
• Flag interactive use as a governance exception Investigate service accounts that show RDP, console logon, or other human-like activity, because those behaviours usually indicate boundary drift.

Bottom line: Active Directory service accounts create risk when they are treated like ordinary user objects even though they behave like persistent machine identities.

Explore further

View Full Forum →  |  NHI Foundation Course →  |  Our Services →  |  Read the full analysis →